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In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
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319
@NotNull: The CharSequence, Collection, Map or Array object is not null, but can be empty.
@Not...
How to suppress warnings globally in an R Script
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You could use
options(warn=-1)
But note that turning off warning messages globally might not be a good idea.
To turn warnings back on, use
options(warn=0)
(or whatever your default is for warn, see this answer)
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How to compare times in Python?
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132
You can't compare a specific point in time (such as "right now") against an unfixed, recurring...
Twig ternary operator, Shorthand if-then-else
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answered Aug 5 '12 at 21:51
Ben SwinburneBen Swinburne
21.2k55 gold badges5252 silver badges9393 bronze badges
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What is the JSF resource library for and how should it be used?
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1 Answer
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Stop handler.postDelayed()
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199
You can use:
Handler handler = new Handler()
handler.postDelayed(new Runnable())
Or you c...
Create module variables in Ruby
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159
Ruby natively supports class variables in modules, so you can use class variables directly, an...
How to merge two files line by line in Bash
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You can use paste:
paste file1.txt file2.txt > fileresults.txt
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“render :nothing => true” returns empty plaintext file?
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146
UPDATE: This is an old answer for legacy Rails versions. For Rails 4+, see William Denniss' po...
Why does one hot encoding improve machine learning performance?
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261
Many learning algorithms either learn a single weight per feature, or they use distances between...